Progress on reciprocal latency measurement

tests/ITAPortaudioTests/ReciprocalDAADLatencyMeasurement.m

+%% Generate excitation signal
+sweep_raw = ita_generate_sweep;
+ita_write_wav( sweep_raw, 'sweep.wav', 'nBits', 32, 'overwrite' );
+
+%% Evaluate recording
+recordA = ita_read( 'recordA.wav' );
+recordB = ita_read( 'recordB.wav' );
+
+recordA.pt
+recordB.pt